Decorative plate

ABSTRACT

A decorative glass or plastic plate comprising a primer layer of a light-permeable polyurethane resin, a transfer-printed layer of a printed image formed of an ink containing a pigment and a binder, and a cured resin layer, these layers being formed consecutively on one surface of a light-permeable glass plate.

This application is a continuation-in-part of now abandoned applicationSer. No. 07/269,715 filed Nov. 10, 1988 now abandoned.

FIELD OF THE INVENTION

This invention relates to a decorative glass plate and decorativeplastic plate usable as a paneling board such as interior wall, ceiling,exterior wall, etc., or for interior decoration.

PRIOR ART OF THE INVENTION

As examples of a decorative glass plate or decorative plastic plate, itis possible to cite a decorative plate manufactured by forming a printedsilk screen directly on transparent glass plate or plastic plate (to besometimes referred to as a light-permeable plate), or a laminated glassor plastic plate formed by placing a printed layer between glass patesor plastic plates.

Japanese Laid-Open Patent Publication No. 65584/1975 describes anintermediate film for a laminated glass, which is formed by providing atransfer-printed layer between two polyvinyl butyral resin films. When adecorative glass plate is manufactured by using this intermediate film,it is necessary to place the intermediate film between two glass platesand carry out thermal press-bonding of the two glass plates. Thus, thereis a problem that the use of two glass plates increases themanufacturing cost. And a paneling board cannot be produced by using oneglass plate and the above intermediate film, since the thermally bondedfilm exposes one surface of its own.

Japanese Laid-Open Utility Model Publication No. 38028/1984 describes apaneling board manufactured by forming a pattern layer on one surface ofa transparent acryl plate by means of transfer and bonding a transparentglass plate onto the other surface of the transparent acryl plate, i.e.opposite to the pattern layer. In this case, bubbles tend to becontained in a binder solution, and a skilled bonding operation isnecessary to obtain bubble-free paneling boards having high commercialvalue. Japanese Laid-Open Utility Model Publication No. 156839/1981describes a decorative glass plate obtained by carrying out steps offorming a photosensitive resin layer on one surface of a transparentplate and forming a printed layer on said photosensitive layer,repeating steps of forming a photosensitive resin layer and then aprinted layer to effect a multicolor printing, laminating a glass platethereon, and then subjecting the laminate to UV irradiation to cure thephotosensitive layers. This decorative glass plate uses a photosensitiveresin as a bonding layer and packing layer. Since, however, most glassplates are impermeable to UV ray except special glass plates, there isdifficulty in carrying out the curing of the photosensitive layers.

Japanese Laid-Open Patent Publication No. 94460/1983 describes a patternlayer-formed article manufactured by providing a transparent orsemitransparent resin layer to one surface of a mold, placing a transfersheet on said resin layer while said resin layer is uncured orsemi-cured, curing said resin layer, then separating the transfer sheetto complete the transfer of the pattern, then laminating an intermediatelayer on the pattern side of the resin layer, and forming a substratelayer on the intermediate layer. In this case, since the transfer iscarried out while the resin layer is uncured or semicured, the surfacenature of the resin layer is very sticky. For this reason, there is aproblem that contamination with air is likely to occur, thus making itdifficult to carry out a uniform transfer of a pattern.

Further, there is known a decorative glass plate which is made bylaminating a transparent film having a print on one surface thereof on aglass plate by means of a binder. However, this decoractive glass plateis not sufficient as a paneling board for semi-permanent use. That isbecause it has a problem that two components thereof tend to separatefrom each other in the bonded portion depending upon ambient temperatureand humidity.

Japanese Laid-Open Patent Publication No. 166737/1988 dislcoses atransfer-printed decorative glass plate manufactured by forming a resincoating film of a transparent layer of a resin dyeable with a sublimabledye and an opaque layer on the surface of a glass substrate, andmounting a transfer paper, on which patterns are formed of an inkcontaining the sublimable dye, on the resin coating film to transfer thepatterns to the resin coating film. In this decorative glass pate, thesublimable dye has to shift to the transparent layer through the opaquelayer, and the use of the sublimable dye is essential. Thus, thisdecorative glass plate has a problem that it is inferior in resistanceto light.

SUMMARY OF THE INVENTION

It is an object of this invention to provide a fine enduring decorativeplate manufactured by accurately transferring fine printing images whichare pre-formed on a transfer sheet by method of gravure printing, etc.

It is another object of this invention to provide a decorative platewhich can be manufactured by using one light-permeable plate.

It is still another object of this invention to provide a decorativeplate which can be manufactured at low costs.

It is yet another object of this invention to provide a decorative platewhich can be manufactured by uniformly transferring a printing imageformed on a transfer sheet without air bubbles at the time of thetransfer.

It is further mother object of this invention to provide a decorativeplate which can be manufactured without using any special glass orspecial plastic plate such as a UV ray-permeable one, and the like.

This invention provides a decorative glass plate manufactured byconsecutively forming a primer layer of light-permeable polyurethaneresin, a transfer-printed layer having a transferred image formed of anink containing a pigment and and a binder, and a cured resin layer onone surface of a light-permeable glass plate.

Further, this invention provides a decorative plastic plate manufacturedby consecutively forming a primer layer of light-permeable polyurethaneresin, a transfer-printed layer having a transferred image formed of anink containing a pigment and a binder, and a cured resin layer on onesurface of a light-permeable plastic plate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a cross sectional view ofthe decorative glass plate of this invention. DETAILED DESCRIPTION OFTHE INVENTION

The constitution of the decorative plate (decorative glass plate ordecorative plastic plate) of this invention will be explained on thebasis of the use of a light-permeable glass plate and by referring tothe drawings, in which a primer layer 12, a transfer-printed layer 13and a cured resin layer 14 are formed on one surface of alight-permeable plate 11.

In this invention, the plate has to be one through which thetransfer-printed layer can be viewed. There is no limitation on thethickness of the light-permeable plate. Practically, however, plateshaving a thickness of 1 to 10 mm are preferably used. Thelight-permeable plate has only to be permeable to visible light, and itdoes not have to be any special one such as a UV ray-permeable glass, orthe like, preferred examples of the plastic plate include polymethylmethacrylate, polycarbonate, polyethylene terephthalate, nylon, epoxy,polymethyl pentene, etc. When the light-permeable plate is a glassplate, it is desirable to subject the glass plate 11 to surfacetreatment with silane coupling agent before formation of the primerlayer in view of good intimate contact of the primer layer to thesurface of the glass plate 11. When a plastic plate is used as alight-permeable plate, it is possible to obtain good intimate contact ofthe primer layer to the surface of the plastic plate without any specialsurface treatment as above. However, the plastic plate surface may betreated with corona discharge, etc., as required.

Examples of the silane coupling agent usable in this invention includeγ-glycidoxypropyltrimethoxysilane,β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane,N-(dimethoxymethylsilylpropyl)ethylenediamine,N-(triethoxysilylpropyl)ethylenediamine, γ-amino-propyltriethoxysilane,vinyltriethoxysilane, vinyl tris(β-methoxyethoxy)silane, etc.

In this invention, the primer layer is a coating resin layer formed onthe surface of the light-permeable plate and having a thickness of 1 to100 μm, and it works such that the transfer-printed layer can be firmlyattached to the plate. This invention uses, as a primer layer, a roomtemperature-curing polyurethane resin coating composition obtained frompolyisocyanate and polyol. It is difficult to use thermosetting resin inthis invention due to the use of a glass plate. When a glass plate isused as a light-permeable plate, a room temperature-curing resin isused. If the resin is cured at a high temperature, there is a risk thatcracking will occur in the glass. Especially preferably usable is anon-yellowing polyurethane coating composition composed of aliphaticpolyisocyanate or alicyclic polyisocyanate such ashexamethylenediisocyanate as polyisocyanate, since such a coatingcomposition does not undergo any yellowing change in exposure to lightfor a long period of time. Further, for the use of the decorative plateas an exterior wall, and the like, preferably usable is a polyurethaneresin composed of a fluorine resin-based polyol having excellentdurability.

Examples of the polyisocyanate usable in this invention are aliphaticpolyisocyanate such as trimethylene diisocyanate, tetramethylenediisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate,1,2-butylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate,2,2,4-trimethylhexamethylene diisocyanate, 2,6-diisocyanatomethylcaproate, and alicyclic polyisocyanate such as 1,3-cyclopentanediisocyanate, 1,4-cyclohexane diisocyanate, 1,3-cyclohexanediisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate,methyl-2,4-cyclobexane diisocyanate, methyl-2,6-cyclohexanediisocyanate, and the like.

Examples of the polyol useful in this invention include compounds havingabout 2 to 6 functional groups, preferably about 2 to 4 functionalgroups, and a molecular weight of 200 to 10,000, preferably about 300 to5,000. More particularly, there may be mentioned polyester polyols,polyors, acrylic polyors, polyurethane polyols or mixtures thereof.

Examples of such polyester polyols include polyester polyols obtained byreacting dibasic acids, such as terephthalic acid, isophthalic acid,adipic acid and sebacic acid, their dialkyl ester or a mixture thereofwith glycol, such as ethylene glycol, propylene glycol, diethyleneglycol, butylene glycol or neopentyl glycol, or a mixture thereof.

Examples of the polyether polyols include polyether polyols obtained bypolymerizing oxirane compounds such as ethylene oxide, propylene oxide,butylene oxide and tetrahydrofuran with the use of water or lowmolecular weight polyol, such as ethylene glycol, propylene glycol,trimethylolpropane or glycerol, as initiator.

Examples of the acrylic polyols include those obtained by copolymerizingmonomers having not less than one hydroxyl group in the molecule, suchas hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxypropylacrylate, hydroxybutyl acrylate, etc., or their correspondingmethacrylic acid derivatives, with acrylic acid, methacrylic acid ortheir esters.

The polyurethane polyols are polyols having urethane linkage in themolecule and are for example obtained by reacting polyether polyols,polyester polyols or polyether ester polyols having a molecular weightof about 200 to 5,000 with the above-mentioned organic polyisocyanatesin the NCO/OH ratio of less than about 1, preferably not more than about0.8.

Furthermore, the primer layer also has to be permeable to light, sincethe transfer-printed layer has to be viewed therethrough. For thisreason, clear coating compositions are used as such.

In this invention, the transfer-printed layer is formed by transferringa printing image of any pattern to the surface of the primer layer. Forthe transfer-printed layer 13, there is used a transfer sheet obtainedby pre-printing an image on a substrate such as polyester film, etc., bygravure printing method. For example, the transfer-printed layer can beformed by bringing the printed surface of the transfer sheet intothermal contact with the surface of the primer layer under pressure. Anink containing, as a binder, at least one selected from a vinylchloride-vinyl acetate copolymer, polyvinyl chloride,polyvinylidenechloride, polyvinylacetete, acrylic resin, rubber chlorideand cyclized rubber is usable for the above printing on the transfersheet. An ink containing, as a binder, a vinyl chloride-vinyl acetatecoplymer is especially preferably usable. The reason therefor is thatsince this copolymer resin has a coefficient of thermal expansion nearlyidentical with that of urethane resin, neither cracking nor shrinkingoccurs in the transfer-printed layer when the resultant glass plate iscooled after the transfer.

An ink in which 1 to 300 parts by weight of a pigment is dispersed in100 parts by weight of the binder is preferably usable. And, forexample, when a printing image is formed on a transfer sheet by agravure printing method, the above ink is adjusted such that itsnonvolatile content in a solvent is 50 to 15% by weight. Thetransfer-printed layer is formed by pressing a printing image of theabove ink under heat at a temperature of 150° to 80° C., and in thiscase, the thickness of the layer of the ink is preferably 1 to 5 μm.

In this invention, the cured resin layer is formed in order to reinforcethe transfer-printed layer and improve durability of the decorativeplate. Particularly, it is desirable that the cured resin layer isformed of a covering ability-possessing coating composition containing apigment such as titanium white, carbon black, and the like, to make atransfer-printed image clearer. The cured resin layer may contain up to60% by weight of a pigment. The same polyurethane resin as that used inthe primer layer may be used for the cured resin layer. Further, otherresins, e.g. unsaturated polyester resin, are also usable if thoseresins are curable at room temperature or low temperature. The thicknessof the cured resin layer is not limited. However, the cured resin layerhas a thickness of, preferably, not less than 5 μm in view ofimprovement in durability of the decorative glass plate.

When the light-permeable plate is a plastic plate, it is preferable toform a hard coat layer on the other surface of the plastic plate whichis opposite to its surface on which the transfer-printed layers, etc.,are formed. The hard coat layer is a coating film having excellentresistance to marring which tends to occur on the surface of the plasticplate. The hard coat layer is formed of a clear coating composition,since the transfer-printed layer has to be viewed through thelight-permeable plate. The coating composition to form the hard coatlayer may be that which can form a coating film having excellentresistance to marring, and no other special limitation is imposedthereon. Examples of the coating composition above includeorganoalkoxysilane using a heat-curable silicone-based resin,photo-setting, e.g. UV ray-setting epoxy, urethane or polyester-basedacrylic coating compositions, and the like. Preferably usable are roomtemperature-curing or photo-setting coating compositions.

Unlike a laminate of glass pates or plastic plates, the decorative plateof this invention is manufactured by forming layers of curable resins ona glass plate or plastic plate. Therefore, its manufacuring cost is lowand its weight is also small. In the decorative glass plate of thisinvention, a fine printing image can be accurately transferred.Therefore, it looks fine and has high decorative value.

Further, in the decorative plate of this invention, since the decorativepattern can be formed by a gravure printing method, etc., its decorativevalue is high. Furthermore, since the transfer-printed layer is setbetween the curable resin layers having excellent durability, thedecorative plate of this invention is excellent in durability andtherefore has high utility as a paneling board for interior and exteriorwalls requiring semipermanent use.

EXAMPLES

The following examples will illustrate this invention more specifically.In the Examples, "%" stands for "weight percent".

EXAMPLE 1

A surface-treating liquid was prepared according to the followingformulation.

    ______________________________________                                        Silane coupling agent (KBM-60) made by Shin-etsu                                                         0.1%                                               Chemical Industries, Ltd.)                                                    Isopropyl alcohol         99.9%                                               ______________________________________                                    

A glass plate having a thickness of 10 mm was immersed in a 5% sodiumhydroxide aqueous solution at 40° C. for 1 minute and taken out. Then,ion-exchanged water was sprayed onto the glass plate for 30 seconds towash away alkali liquid remaining on the surface thereof, and the glassplate was then dried in heated air at 80° C. for 3 minutes. Thereafter,the above surface-treating liquid was sprayed uniformly onto the glassplate by using a spray gun, and the glass plate was dried in heated airat 80° C. for 1 minute.

Then, a urethane resin clear coating composition for a primer layer wasprepared according to the following formulation.

    ______________________________________                                        Main Component:                                                               Acrylic polyol (Hitaloid 3008 made by Hitachi                                                             67.0%                                             Chemical Ind., Ltd.)                                                          Stannous octoate (made by Nippon Chemical Ind.,                                                            0.1%                                             Ltd.)                                                                         Methyl ethyl ketone         20.0%                                             Toluene                     12.9%                                             Curing Agent:                                                                 Hexamethylenediisocyanate (Sumidur N-75 made by                                                           100.0%                                            Sumitomo-Bayer Urethane, Ltd.)                                                ______________________________________                                    

The above main component and curing agent were mixed in a weight ratioof 6:1. Then, the mixture was sprayed onto the glass plate, of which thesurface had been treated with the surface-treating liquid, by using aspray gun, and the glass plate was dried in heated air at 80° C. for 20minutes. The thickness of the dried coating was adjusted to 10 microns.Thereafter, a transfer film prepared by printing a pattern on apolyester film with an ink containing a vinyl chloride-vinyl acetatecopolymer as a binder was brought into contacted with the glass plateunder pressure after the coating on the glass plate was heated to 100°C. The glass plate was then cooled to and the polyester film was peeledoff to complete the transfer of the pattern onto the urethane coating,Then, a urethane resin white coating was prepared according to thefollowing formulation.

    ______________________________________                                        Main Component:                                                               Acrylic polyol (Hitaloid 3008 made by Hitachi                                                             50.0%                                             Chemical Ind., Ltd.)                                                          Titanium white pigment (Tipaque R-820 made by                                                             20.0%                                             Ishihara Sangyo K.K.)                                                         Stannous octoate (made by Nippon Chemical Ind.,                                                            0.1%                                             Ltd.)                                                                         Methyl ethyl ketone         10.0%                                             Toluene                      9.9%                                             Curing Agent:                                                                 Hexamethylenediisocyanate (Sumidur N-75 made by                                                           100.0%                                            Sumitomo-Bayer Urethane, Ltd.)                                                ______________________________________                                    

The above main component and curing agent were mixed in a weight ratioof 8:1, and the mixture was uniformly sprayed onto the glass plate, onwhich the transfer treatement had been completed, by using a spray gun.Then, the glass plate was dried in heated air at 80° C. for 30 minutes.The thickness of the dried coating was adjusted to 10 microns. Theresultant bonding of the pattern-printed coating film to the glass wasfirm, and a cross cut adhesion test using a cellophane adhesive tapeshowed 100/100.

EXAMPLE 2

A surface-treating liquid was prepared according to the follwoingformulation.

    ______________________________________                                        Silane coupling agent (KBM-603 made by Shin-etsu                                                           0.1%                                             Chemical Industries, Ltd.)                                                    Isopropyl alcohol           99.9%                                             ______________________________________                                    

A glass plate having a thickness of 10 mm was immersed in a 5% sodiumhydroxide aqueous solution at 40° C. for 1 minute, and taken out. Then,ion-exchanged water was sprayed onto the glass plate for 30 seconds towash away alkali liquid remaining on its surface, and the glass platewas dried in heated air at 80° C. for 3 minutes. Thereafter, thesurfaces of the glass plate were wiped with a gauze which had beendipped in the above surface-treating liquid, to apply thesurface-treating liquid, and the glass plate was dried at 80° C. for 1minute.

Then, the same urethane resin clear coating composition for a primerlayer as that used in Example 1 was sprayed uniformly onto the glassplate treated with the surface-treating liquid, by using a spray gun,and the glass plate was dried in heated air at 20 minutes. The thicknessof the dried coating was adjusted to 10 microns. Thereafter, a transferfilm prepared by printing a pattern on a polyester film with an inkcontaining a vinyl chloride-vinyl acetate copolymer as a binder wasbrought into contact with the glass plate under pressure after thecoating on the glass plate was heated to 100° C. The glass plate wasthen cooled to 50° C., and the polyester film was peeled off to completethe transfer of the pattern onto the urethane coating.

Then, a urethane resin black coating composition was prepared accordingto the following formulation.

    ______________________________________                                        Main Component:                                                               Acrylic polyol (Hitaloid 3008 made by Hitachi                                                              50.0%                                            Chemical Ind., Ltd.)                                                          Carbon black pigment (Carbon black MA-100 made by                                                           2.0%                                            Mitsubishi Chemical Ind., Ltd.)                                               Stannous octoate (made by Nippon Chemical Ind., Ltd.)                                                       0.1%                                            Methy ethyl ketone           25.0%                                            Toluene                      22.9%                                            Curing Agent:                                                                 The same diioscyanate as that used in Example 1.                              ______________________________________                                    

The same diioscyanate as that used in Example 1.

The above main component and curing agent were mixed in a weight ratioof 8:1. The mixture was uniformly sprayed, by using a spray gun, ontothe glass plate on which the transfer was completed. The glass plate wasdried in heated air at 80° C. for 30 minutes. The thickness of thecoating was adjusted to 10 microns. The resultant bonding of thepattern-printed coating to the glass was firm, and a cross cut adhesiontest using a cellophane adhesive tape showed 100/100.

EXAMPLE 3

A UV curable urethane-based acrylic coating composition was preparedaccording to the following formulation.

    ______________________________________                                        Urethane acrylate (Olester RA-1353, made by Mitsui                                                        30.0%                                             Toatsu Chemicals, Inc.)                                                       2,2'-Dimethoxy-2-phenyldiacetophenone                                                                      0.5%                                             Ethyl acetate               30.0%                                             Toluene                     15.0%                                             Isopropyl alcohol           15.0%                                             Cellosolve acetate           9.5%                                             ______________________________________                                    

The coating composition was uniformly sprayed onto one surface of apolycarbonate plate having at thickness of 5 mm by using a spray gun,the solvent was dried off with heated air in an oven, and the coatingwas irradiated with UV ray for 3 seconds by using a high-pressuremercury lamp (90 W/cm) to cure the coating. The cured coating wasexcellent in resistance to marring, and it was not marred at all evenwhen it was rubbed with a steel wool #0000.

Then, a urethane resin clear coating composition for a primer layer wasprepared according to the following formulation.

    ______________________________________                                        Main Component:                                                               Acrylic polyol (Hitaloid 3008, made by Hitachi                                                            67.0%                                             Chemical Ind., Ltd.)                                                          Stannous octonate (made by Nippon Chemical Ind.,                                                           0.1%                                             Ltd.)                                                                         Methyl ethyl ketone         20.0%                                             Toluene                     12.9%                                             Curing Agent:                                                                 Hexamethylenediisocyanate (Sumidur N-75, made by                                                          100.0%                                            Sumitomo-Bayer Urethane, Ltd.)                                                ______________________________________                                    

The above main component and curing agent were mixed in a weight ratioof 6:1, the mixture was uniformly sprayed, by using a spray gun, ontothe other surface of the polycarbonate plate opposite to the surfacewhich had been subjected to the above hard coat treatment, and thecoating was dried in heated air at 80° C. The thickness of the driedcoating was adjusted to 10 microns. Thereafter, a transfer film preparedby printing a pattern on a polyester film with an ink containing a vinylchloride-vinyl acetate copolymer as a binder was brought into contactwith the polycarbonate plate under pressure after the coating on thepolycarbonate plate was heated to 100° C. The polycarbonate plate wasthen cooled to 50° C., and the polyester film was peeled off to completethe transfer of the pattern onto the urethane coating. Then, a urethaneresin white coating composition having the following formulation for acured resin layer was prepared.

    ______________________________________                                        Main Component:                                                               Acrylic polyol (Hitaloid 3008, made by Hitachi                                                            50.0%                                             Chemical Ind., Ltd.)                                                          Titanium white pigment (Tipaque R-820 made by                                                             20.0%                                             Ishihara Sangyo K.K.)                                                         Stannous octonate (made by Nippon Chemical Ind.,                                                           0.1%                                             Ltd.)                                                                         Methyl ethyl ketone         10.0%                                             Toluene                      9.9%                                             Curing Agent:                                                                 Hexamethylenediisocyanate (Sumidur N-75, made by                                                          100.0%                                            Sumitomo-Bayer Urethane, Ltd.)                                                ______________________________________                                    

The above main component and curing agent were mixed in a weight ratioof 6:1, the mixture was uniformly sprayed, by using a spray gun, ontothe polycarbonate plate opposite to the surface on which the abovetransfer treatment was completed, and the coating was dried in heatedair at 80° C. The thickness of the coating was adjusted to 10 microns.

The above bonding of the coating to the polycarbonate was firm, and across cut adhesion test using a cellophane adhesive tape showed 100/100.

EXAMPLE 4

The same urethane resin clear coating composition as that described inExample 1 was uniformly sprayed, by using a spray gun, onto a surface ofa polycarbonate plate having a thickness of 5 mm, opposite to thesurface of the polycarbonate plate which had been subjected to a hardcoat treatment, and the resultant coating was dried in heated air at 80°C. The thickness of the coating was adjusted to 10 microns. Thereafter,a transfer film prepared by printing a pattern on a polyester film withan ink containing a vinyl chloride-vinyl acetate copolymer as a binderwas brought into contact with the polycarbonate plate under pressureafter the coating on the polycarbonate plate was heated to 100° C. Thepolycarbonate plate was then cooled to 50° C., and the polyester filmwas peeled off to complete the transfer of the pattern onto the urethanecoating.

Then, a urethane resin black coating composition was prepared accordingto the following formulation.

    ______________________________________                                        Main Component:                                                               Acrylic polyol (Hitaloid 3008 made by Hitachi                                                              50.0%                                            Chemical Ind., Ltd.)                                                          Carbon black pigment (Carbon black MA-100 made by                                                           2.0%                                            Mitsubishi Chemical Ind., Ltd.)                                               Stannous octoate (made by Nippon Chemical Ind., Ltd.)                                                       0.1%                                            Methyl ethyl ketone          25.0%                                            Toluene                      22.9%                                            Curing Agent:                                                                 The same diioscyanate as that used in Example 1                               ______________________________________                                    

The above main component and curing agent were mixed in a weight ratioof 8:1. The mixture was uniformly sprayed, by using a spray gun, ontothe glass plate on which the transfer was completed. The polycarbonateplate was dried in heated air at 80° C. for 30 minutes. The thickness ofthe coating was adjusted to 10 microns. The resultant bonding of thepattern-printed coating to the plastic was firm, and a cross cutadhesion test using a cellophane adhesive tape showed 100/100.

What is claimed is:
 1. A decorative glass plate comprising a primerlayer of light-permeable polyurethane resin which is a roomtemperature-curing resin and has a thickness of .Iadd.1 to .Iaddend.100μm a transfer-printing layer of a printed image formed of an inkcontaining a pigment and a binder, and a cured resin layer, these layersbeing formed consecutively on one surface of a light-permeable glassplate.
 2. A decorative glass plate according to claim 1 wherein thepolyurethane resin is a nonyellowing polyurethane resin.
 3. A decorativeglass plate according to claim 2 wherein the polyurethane resincomprises a polyisocyanate which is an aliphatic polyisocyanate oralicyclic polyisocyanate.
 4. A decorative glass plate according to claim1 wherein the transfer-printed layer is formed by bringing a printedsurface of a transfer sheet on which a printing image is formed intothermal contact with the primer layer under pressure.
 5. A decorativeglass plate according to claim 4 wherein the printing image formed onthe transfer sheet is formed of an ink containing a vinyl chloride-vinylacetate copolymer.
 6. A decorative glass plate according to claim 1wherein the cured resin layer comprises a room temperature-curing resin.7. A decorative glass plate according to claim 6 wherein the cured resinlayer contains up to 60% by weight of a pigment.
 8. A decorative glassplate according to claim 4 wherein the transfer sheet has an imageformed by a gravure printing method.
 9. A decorative plastic platecomprising a primer layer of a light-permeable polyurethane resin whichhas a thickness of 1 to 100 μm, a transfer-printed layer of a printedimage formed of an ink containing a pigment and a binder, and a curedresin layer, these layers being formed consecutively one one surface ofa light-permeable plastic plate.
 10. A decorative plastic plateaccording to claim 9 wherein the light-permeable plastic plate is formedof at least one plastic selected from a group consisting of polymethylmethacrylate, polycarbonate, polyethylene terephthalate, nylon, epoxyand polymethyl pentene.
 11. A decorative plastic plate according toclaim 9 wherein the polyurethane resin is a nonyellowing polyurethaneresin.
 12. A decorative plastic plate according to claim 9 wherein thepolyurethane resin comprises a polyisocyanate which is an aliphaticpolyisocyanate or alicyclic polyisocyanate.
 13. A decorative plasticplate according to claim 9 wherein the transfer-printed layer is formedby bringing a printed surface of a transfer sheet on which a printingimage is formed into thermal contact with the primer layer underpressure.
 14. A decorative plastic plate according to claim 13 whereinthe printing image formed on the transfer sheet is formed of an inkcontaining a vinyl chloride-vinyl acetate copolymer.
 15. A decorativeplastic plate according to claim 9 wherein the cured resin layercomprises a room temperature-curing resin.
 16. A decorative plasticplate according to claim 15 wherein the cured resin layer contains up to60% by weight of a pigment.
 17. A decorative plastic plate according toclaim 9 wherein the transfer sheet has an image formed by a gravureprinting method.
 18. A decorative plastic plate according to claim 9wherein the light-permeable plastic plate has a hard coat layer formedon one surface thereof, opposite to the surface of the plate on whichthe transfer-printed layer is formed.
 19. A decorative plastic plateaccording to claim 18 wherein the hard coat layer is formed of a coatingcomposition containing a thermosetting resin or a photo-setting resin.